import path from 'path';
import resolve from '@rollup/plugin-node-resolve';
import replace from '@rollup/plugin-replace';
import commonjs from '@rollup/plugin-commonjs';
import url from '@rollup/plugin-url';
import svelte from 'rollup-plugin-svelte';
import babel from '@rollup/plugin-babel';
import {terser} from 'rollup-plugin-terser';
import config from 'sapper/config/rollup.js';
import pkg from './package.json';

const mode = process.env.NODE_ENV;
const dev = mode === 'development';
const legacy = !!process.env.SAPPER_LEGACY_BUILD;

const onwarn = (warning, onwarn) =>
    (warning.code === 'MISSING_EXPORT' && /'preload'/.test(warning.message)) ||
    (warning.code === 'CIRCULAR_DEPENDENCY' && /[/\\]@sapper[/\\]/.test(warning.message)) ||
    onwarn(warning);

export default {
    client: {
        input: config.client.input(),
        output: config.client.output(),
        plugins: [
            replace({
                'process.browser': true,
                'process.env.NODE_ENV': JSON.stringify(mode)
            }),
            svelte({
                compilerOptions: {
                    dev,
                    hydratable: true
                }
            }),
            url({
                sourceDir: path.resolve(__dirname, 'src/node_modules/images'),
                publicPath: '/client/'
            }),
            resolve({
                browser: true,
                dedupe: ['svelte']
            }),
            commonjs(),

            legacy && babel({
                extensions: ['.js', '.mjs', '.html', '.svelte'],
                babelHelpers: 'runtime',
                exclude: ['node_modules/@babel/**'],
                presets: [
                    ['@babel/preset-env', {
                        targets: '> 0.25%, not dead'
                    }]
                ],
                plugins: [
                    '@babel/plugin-syntax-dynamic-import',
                    ['@babel/plugin-transform-runtime', {
                        useESModules: true
                    }]
                ]
            }),

            !dev && terser({
                module: true
            })
        ],

        preserveEntrySignatures: false,
        onwarn,
    },

    server: {
        input: config.server.input(),
        output: config.server.output(),
        plugins: [
            replace({
                'process.browser': false,
                'process.env.NODE_ENV': JSON.stringify(mode)
            }),
            svelte({
                compilerOptions: {
                    dev,
                    generate: 'ssr',
                    hydratable: true
                },
                emitCss: false
            }),
            url({
                sourceDir: path.resolve(__dirname, 'src/node_modules/images'),
                publicPath: '/client/',
                emitFiles: false // already emitted by client build
            }),
            resolve({
                dedupe: ['svelte']
            }),
            commonjs()
        ],
        external: Object.keys(pkg.dependencies).concat(require('module').builtinModules),

        preserveEntrySignatures: 'strict',
        onwarn,
    },

    serviceworker: {
        input: config.serviceworker.input(),
        output: config.serviceworker.output(),
        plugins: [
            resolve(),
            replace({
                'process.browser': true,
                'process.env.NODE_ENV': JSON.stringify(mode)
            }),
            commonjs(),
            !dev && terser()
        ],

        preserveEntrySignatures: false,
        onwarn,
    }
};
